Desigling low- power embedded devices considerul consideration of power consumption, especially during sleep modes. Accurate calculations help optimize beat life and ensure device reliability.

Understanding Power Consumption

Power consumption in embedded devices is primarily determied by the curret draw during active and sleep states. Measuring and calculating these values allows issuers to estimate batry life and identifify areas for optimization.

Calculating Sleep Mode Current

Te current during sleep mode, often denoted as curren1; curren1; Cr001; Cr003; Cr003; I _ sleep curren1; Cr001; Cr003;, is a kritical factor. To estimate te te batry life, use them formula:

CLAS1; CLAS1; CLAS3; CLAS3; CLAS3; CLAS3e (hodinové) = CLAS3e (hodinové) = CLAS3e (ccaS3e) / I _ sleep (ccaS31; CLAS3f; CLAS3f: 1 CLAS3f;

Odhadovaný objem Total Power Consumption

To determe overall power consumption, condider both active and sleep periods. Thee average curret, curren1; current 1; cr001; cr001; cr003; cr003; cr00003; cr00004:

CLANE1; CLANE1; FLT: 0 CLANE3; CLANE3; I _ avg = (I _ active × t _ active + I _ sleep × t _ sleep) / (t _ active + t _ sleep) CLANE1; CLANE1; CLANE3; CLANE3;

Practical Calculation Example

Supe a device has a batry capacity of 2000mAh, a sleep currentt of 10μA, and an active current of 20mA. If thee device spends 90% of thee time spaming and 10% active, thee average current is:

  • I _ sleep = 0.01mA
  • I _ active = 20mA
  • t _ sleep = 90%
  • t _ active = 10%

Calculating CLAS1; CLAS1; CLAS3; CLAS3; I _ avg CLAS1; CLAS1; CLAS1; CLAS3; CLAS3;

CLAS1; CLAS1; CLAS3; CLAS3; I _ avg = (20mA × 0,10 + 0,01mA × 0,90) / 1 = 2.001mA CLAS1; CLAS1; CLAS1; CLAS31; CLAS33;

Odhadovaný život v bitevním provedení:

CLANE1; CLANE1; CLANE3; CLANE3; CLANE3; CLANE3; CLANE3; CLANE3h / 2.001mA CLANE31; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CLANE3c; CCANE3c; CLANE3c; CLANE3c)